gowerc commented on issue #45751:
URL: https://github.com/apache/arrow/issues/45751#issuecomment-2720501383
hmm I'm not sure to be honest. I mean on the surface it definitely appears
to be related but I'm not sure its exactly the same. In that ticket the issue
seems to be a mismatch in how arrow / python interpolate missing rules when
going into the future. Here however I can clearly see that the rules in my
local tzdata database extend up until 2499:
```
> zdump -v America/New_York
<snip>
America/New_York Sun Mar 9 06:59:59 2498 UT = Sun Mar 9 01:59:59 2498 EST
isdst=0 gmtoff=-18000
America/New_York Sun Mar 9 07:00:00 2498 UT = Sun Mar 9 03:00:00 2498 EDT
isdst=1 gmtoff=-14400
America/New_York Sun Nov 2 05:59:59 2498 UT = Sun Nov 2 01:59:59 2498 EDT
isdst=1 gmtoff=-14400
America/New_York Sun Nov 2 06:00:00 2498 UT = Sun Nov 2 01:00:00 2498 EST
isdst=0 gmtoff=-18000
America/New_York Sun Mar 8 06:59:59 2499 UT = Sun Mar 8 01:59:59 2499 EST
isdst=0 gmtoff=-18000
America/New_York Sun Mar 8 07:00:00 2499 UT = Sun Mar 8 03:00:00 2499 EDT
isdst=1 gmtoff=-14400
America/New_York Sun Nov 1 05:59:59 2499 UT = Sun Nov 1 01:59:59 2499 EDT
isdst=1 gmtoff=-14400
America/New_York Sun Nov 1 06:00:00 2499 UT = Sun Nov 1 01:00:00 2499 EST
isdst=0 gmtoff=-18000
```
I also get the correct expected behaviour from both R, Python and Cpp which
as far as I can tell are all using the system tzdata source as well so they
should be consistent.
```python
import zoneinfo
import datetime
def printtime(time: int):
ny_time = datetime.datetime.fromtimestamp(time,
zoneinfo.ZoneInfo("America/New_York"))
print(f"Time: {ny_time} ({ny_time.tzname()})")
print(zoneinfo.TZPATH) # ('/usr/share/zoneinfo', '/usr/lib/zoneinfo',
'/usr/share/lib/zoneinfo', '/etc/zoneinfo')
printtime(2095940701) # Time: 2036-06-01 09:45:01-04:00 (EDT)
printtime(2127476701) # Time: 2037-06-01 09:45:01-04:00 (EDT)
printtime(2159012701) # Time: 2038-06-01 09:45:01-04:00 (EDT)
printtime(2190548701) # Time: 2039-06-01 09:45:01-04:00 (EDT)
```
```R
as.POSIXct(2095940701, tz = "America/New_York") # "2036-06-01 09:45:01
EDT"
as.POSIXct(2127476701, tz = "America/New_York") # "2037-06-01 09:45:01
EDT"
as.POSIXct(2159012701, tz = "America/New_York") # "2038-06-01 09:45:01
EDT"
as.POSIXct(2190548701, tz = "America/New_York") # "2039-06-01 09:45:01
EDT"
```
```cpp
#include <iostream>
#include <chrono>
#include <format>
void printme(long long x) {
std::chrono::sys_seconds utc_time{std::chrono::seconds(x)};
std::chrono::zoned_time ny_time{"America/New_York", utc_time};
std::cout << "Local time: " << std::format("{:%F %T %Z}", ny_time) <<
'\n';
}
int main() {
std::cout << "C++ Standard Version: " << __cplusplus << std::endl; //
2020
printme(2095940701); // Local time: 2036-06-01 09:45:01 EDT
printme(2127476701); // Local time: 2037-06-01 09:45:01 EDT
printme(2159012701); // Local time: 2038-06-01 09:45:01 EDT
printme(2190548701); // Local time: 2039-06-01 09:45:01 EDT
}
```
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